Signa S2 - Bluetooth questions

I am connecting via bluetooth to my android tv box and phone.
I noticed that just a short interval if there is no audio going to the soundbar it will auto switch back to AUX/TV., is that normal?
And also if i switch off the soundbar or change between BT and AUX, the settings such as bass levels/mode are not saved and i have to reduce the bass again - this is still on BT.

Anyone has the same thing? i havent tested on optical cable though.